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This CL introduces the (empty) AgentSchedulingGroupHost class, that is owned by the RenderProcessHost.
For now, a new ASGH is created per RPH.

Bug: 1111231
Change-Id: Ib384fc34e4fa72e6c1c9e709e4599da1f82a6bc8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2294699
Commit-Queue: Tal Pressman <talp@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796741}